Drier



L. R! CHRISHE.

DRIER.

APPLICATION 'gHLED JAN.6 1919.

Patented Oct. 7, 1919.

5 Q. XWZW ans a*r DRIER.

Specification of Letters Patent.

Patented @ct. t, 1919.

Application filed January 6, 1919. Serial No. 269,754.

To all whom it may concern Be it known that I, LINDSAY R. CHRISTIE, acitizen of the United States, and a resident of Pittsburgh, in thecounty of Allegheny and State of Pennsylvania, have invented a new anduseful Improvement in Drier's; and

I do hereby declare the following to be a full, clear, and exactdescription thereof.

My invention relates to driers, and has special reference to what areknown as indirect heat driers for use in drying powdered and granular orclayey material.

The object of my invention is to produce a cheap, simple and eflicientform of a drier which can be conveniently and easily operated, will bestrong, compact and not liable to get out of order, andwill quickly andthoroughly dry the material fed to the same.

To these ends my invention consists, generally stated, in the novelconstruction, arrangement and combination of parts, as hereinafter morespecifically set forth and described and particularly pointed out in theclaims. n

To enable others skilled in the art to which my invention appertains toconstruct and use my improved drier, T will describe the same morefully, referring to the accompanying drawings, in which- Figure 1 is aYertical longitudinal section of the drier;

Fig. 2 is a front end view of the same;

Fig. 3 is a rear end view of the same; and

a Fig. .4 is a cross section on the 'line 4-4 Fig. 1.

Like symbols of reference herein indicate like parts in each ofthe'figures of the drawings.

As illustrated in the drawings, my improved drier is shown at A and iscomprised of the cylindrical member B and the furnace portion C, whichare mounted on any suitable foundation. The furnace C extends around andincloses the cylindrical member B and such member is set at an inclinetherein. The furnace C is so arranged that complete combustion will beinsured by any suitable means for the gasesto be generated by suchfurnace, and a relief stack I) having a damper b is provided on the topof the furnace in order to carry the hot gases from the furnace to theatmosphere in case ratus. The cylindrical member B comprises the outershell 1 and the flue or inner shell 2, which are separated from eachbther to form the chamber or space 3 between the same. The flue2 issupported by the nozzles hereinafter described and by the arms 4connected to such shells and secured by the angles 4, with such armsbeing loosely mounted in the angles 4 to allow for unequal expansion inthe shells 1 and 2. These shells 1 and 2 are adapted to be rotatedtogether within the furnace C by means of any suitable mechanism 5,which is supported on a base a at the rear end of the member B andbeyond the furnace C, such as by the suitable gearing 6 connecting witha gear wheel 7 around the outer shell 1 operated by any suitable sourceof power. The base a and the base a at the front end of the member Bbeyond the furnace C also supports suitable bearing wheels 8, whichengage with bearing rings 9 surrounding the outer shell 1.

Fitting over the supporting-arms 4 are I the flights 10 and 11, theflights 10 being secured at one end to angles 10 on the interior of theouter shell 1 and extending into the space 3, and the flights 11 beingsecured at one end to the angles-11 on the exterior of the shell 2andextending into said space. The flights 10 may also be bent upwardlyat their inner free ends to form the shelf por tion 12 thereon.

\Vithin the furnace C and connected between the outer shell -1 and theflue or inner shell 2 are a series of nozzles 18 whichact as ductsbetween the exterior of the shell 1 and the interior of the flue 2 forthe passage {of the gases from said furnace into said Mounted on top ofthe furnace C is the exhaust fan 14, which has the exhaust flue 15connected to the same and t0 the head 18 at the front end of thecylinder B opposite the flue or inner shell 2. An exhaust flue lti'isalso connected toa fan 17 located on top of said furnace and such flue16 leads through a head 18 at the front end of the member B and into thechamber 19. A hopper 18 leads into the chamber 19 through the head'18and within the outer shell 1, and within such chamber are the helicalflights 20 for carrying the material to be dried from the bottom of suchcham-' her into the chamber 3, as the material is fed into the chamber19 by the said hopper. The inner shell 2 has a contracted portion end ofthe outer shell 1 and is 2' at its front end for fittin within a tubularportion 18 on the hea 18 and the exhaust flue 15 opens into said portion2' and is secured to the portion 18 through a belt and flange connection15 between these parts. An asbestos plate 15" is secured between theconnection 15' and portion 18" and bears against the contracted portion2' to prevent the passage of any gases between said stationary portion18" and the rotating portion 2'. 7

At the rear end of the member B is the discharge head 21, which isconnected to the with a discharge opening 22 in t 1e same. This openingis provided with a discharge casting 23 therein having a series ofchutes 24 formed in the same and which communicate with the lower'endsof the buckets 25 formed on said head, so that the material isdischarged through one of said chutes with the rotation of the member Bby the material being carried up by such buckets from the bottom of thecooling chamber 26 formed at the rear end of such shell 1 beyond theshell 2 and thus allow the material to slide down by gravity from one ofsaid buckets through one of the chutes when such bucket and chute reacha substantially vertical position. The chutes 24 may will pass therefromaround the'outer shell,

at the front or feed end, and thensuch gases will follow along. suchshell toward and near the discharge end of the member B, thence suchases will pass through the nozzles 13 and t e" inner flue orshell 2 andthence will be drawn out by the fan 14 through the flue 15.- Thematerial to be dried will be fed into the chamber 19 through the ho per-18 where it will be carried-by the he ical flights 20 and into thechamber 3. With the rotation of the shells '1 and 2 of member B by themechanism 5,

the flights 10 .on the shell 1 will lift the material, so that it fallson the-flights 11 on the flue, or shell 2 where such material will beretained until the rotation of themember B allows it to fall to thebottom of the shell 1, and by reason of the inclination of the shellsthe material will progress along the same from the front or feed end .tothe discharge end, and it will cascade as the member B revolves, whilethe outer flights will continue lifting u the material from the bottomof the chem r 3 to allow rovided being dried.

4 release a a an onto the flights 11 and shell 2' and thus continue tocascade the material and dry the same. 7

When the material reaches the cooling chamber 26 at the rear end of theshell 1, the said material will continue to cascade by the flights 10and such material will glve up its heat, so that the same can be used toassist in dryin the other material passing through the c amber 3, whilethe air as drawn through the chutes 24 in the discharge end casting bythe fan 17 through the chamber 3 and flue 16 will be heated by the driedmaterial and will pass through said drying chamber, there givin up heat.and carrying. away evaporated moisture from the drying material throughsuch fan. It will be obvious that other means can be used for carryingaway the exhaust gases from the inner shell and the evaporated moisturefrom the drying material in the drying chamber, instead of twb fans, asshown and described, while various other modifications and changes inthe design and construction of my improved drier may be resorted to,without departing from thespirit of the invention, or sacrificing any ofits advanta es.. It will'thus e seen that the arrangement of the drierwill give the ideal application .of heat tothe material to be dried andall posslble heat extracted from the gases and dried material. Theapparatus gives the maximum heating surface and capacity for floor spaceand there is no possibility of the furnace gases mixing with thematerial What I claim as my invention and desire to secure by LettersPatent is: a

1. A drier comprising a rotatable d havin an inner shell and an outershell PI'OVI ed w1th a space between thesame, means for-feeding thematerial to be dried into the front end of said spaced portion,

for the material on the rear end of the outer means within spacedportion for catch- 'mgand depositing the material on the exterior of theinner shell, a discharge head shell; means for generating hot gases,means inclo'sing said 'drumfor lacin the gases around the said outer shean means for drawmg such gases from around said outer shell and into andthrough said inner shell for heating the material between said shells.

2. A drier comprising a rotatable drum having an inner shell and anouter shell provl ed with .a space between the same, means for feedlng te material to be dried into the front end of said spaced portion, meanswithin said spaced portion for catchmg and depositing the material onthe exterior of said inner shell, a discharge head for the material onthe rear end of said outer shell, means for generating hot gases, meansinclosing said drum for placing the gases around said outer shell, meansbetween said shells for passing the gases from around the outer shelland into the inner shell, and means for drawing such gases from aroundsaid outer shell and into and through the inner shell to exhaust suchgases and for heating the material between said shells.

'3. A drier comprising a rotatable .drum having an inner shell and anouter shell provided with a space between the same, means for feedingthe material to be dried into the front end of said spaced portion,means within said spaced portion for catching and depositing thematerial on the exterior of said inner shell, a discharge head for thematerial on the rear end of said outer shell, means for generating hotgases, means inclosing said drum for placing the gases around said outershell, nozzles at the rear end of said inner shell for passing the gasesfrom around said outer shell and into said inner shell, and means fordrawing such gases from around said outer shell and into and throughsaid inner shell to its front end'to exhaust such gases and for heatingthe material between said shells.

4. A drier comprising a rotatable drum having an inner shell and anouter shell prosaid inner shell, a discharge head for thevided with aspace between the same, means for feeding the material into the frontend of said spaced portion, means within said spaced portion forcatching and depositing said material on the exterior of said innershell, a discharge head for the material on the rear end of said outershell, and a chamber. for cooling the dried material before beingdischarged through said head.

5. A drier comprising a rotatable drum havin an inner shell and an outershell provi ed with a space between the same, means for feeding thematerial into the front end of said spaced portion, means within saidspaced portion for catching and de' ositing said material on theexterior of material on the rear end of said outer shell, and a coolingchamber at the rear end of said drum for the dried material before beingdischarged throu h said head.

6. A drier comprising a rotatable drum having an inner shell and anouter shell provided with a space between the same, means for feedingthe material into the front end forming an inner shell and an outershell 7 provided with a space between the same, means for feeding thematerial into the frontend of said spaced portion, means in said spacedportion for catching and depositing said material on the exterior ofsaid inner shell, means for applying the heat from the gases around saidouter shell and to the wet material at the front end of said drum, andmeans for again applying said gases to the wet material on said innershell before exhausting said gases.

8. The herein described process of drying powdered or other materialconsisting in applying the heat from the gases to the wet material inthe drier and at the. feeding end of the same, and then again applyingthe heat from the gases to the wet material in the drier before suchgases are exhausted and after they are passed through the drier. Intestimony whereof I, the said LINDSAY R. Onms'rm, have hereunto set myhand.

LINDSAY R. CHRISTIE.

